Remove legacy code to support Python 3.8

Author: jacebrowning

README.md

@@ -17,7 +17,7 @@ Gitman is a language-agnostic dependency manager using Git. It aims to serve as
 
 ### Requirements
 
-- Python 3.8+
+- Python 3.9+
 - Git 2.8+ (with [stored credentials](http://gitman.readthedocs.io/en/latest/setup/git/))
 
 ### Installation

docs/requirements.txt

@@ -65,7 +65,7 @@ requests==2.32.5 ; python_version >= "3.9" and python_version < "4.0"
 rope==0.14.0 ; python_version >= "3.9" and python_version < "4.0"
 ruamel-yaml-clib==0.2.8 ; python_version >= "3.9" and python_version < "3.11" and platform_python_implementation == "CPython"
 ruamel-yaml==0.17.21 ; python_version >= "3.9" and python_version < "4.0"
-setuptools==70.0.0 ; python_version >= "3.9" and python_version < "4.0"
+setuptools==80.9.0 ; python_version >= "3.9" and python_version < "4.0"
 six==1.16.0 ; python_version >= "3.9" and python_version < "4.0"
 sly==0.5 ; python_version >= "3.9" and python_version < "4.0"
 sniffer==0.4.1 ; python_version >= "3.9" and python_version < "4.0"
@@ -76,6 +76,6 @@ types-freezegun==1.1.10 ; python_version >= "3.9" and python_version < "4.0"
 types-setuptools==65.3.0 ; python_version >= "3.9" and python_version < "4.0"
 typing-extensions==4.3.0 ; python_version >= "3.9" and python_version < "4.0"
 universal-startfile==0.2 ; python_version >= "3.9" and python_version < "4.0"
-urllib3==1.26.19 ; python_version >= "3.9" and python_version < "4.0"
+urllib3==2.5.0 ; python_version >= "3.9" and python_version < "4.0"
 watchdog==2.1.9 ; python_version >= "3.9" and python_version < "4.0"
 zipp==3.19.1 ; python_version >= "3.9" and python_version < "4.0"

gitman/models/config.py

@@ -1,5 +1,4 @@
 import os
-import sys
 from typing import Iterator, List, Optional
 
 import log
@@ -450,12 +449,8 @@ def find_nested_configs(
 
 
 def _resolve_current_directory():
-    start = os.getcwd()
-    if sys.version_info < (3, 8) and os.name == "nt":
-        log.warn("Python 3.8+ is required to resolve virtual drives on Windows")
-    else:
-        start = os.path.realpath(start)
-        os.chdir(start)
+    start = os.path.realpath(os.getcwd())
+    os.chdir(start)
     return start